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Crotchety Old Bastard
 
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Is this what you have Darin? This is a Magnaflow 3"In/Dual 3"Out that was used a few years ago on a 400WHP CIS engine. Worked OK, drone acceptable, rather heavy. It has an X pattern interior so most of the exhaust exits the passenger's side which created a problem when measuring AFRs on the dyno.

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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 07-16-2010, 08:12 AM
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Got my dual bb-3inch exhaust back in 1994.. Never had an issue of drone or resonance. I have euro headers-no cat. Never had a fitment issue..JUST PERFECT.

I guess I got lucky.

Walt
Old 07-16-2010, 09:20 AM
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yes, that looks like my set-up. We welded 3.5" SS tubing to the case to give the tail pipes a larger look. I notice zero drone, a nice mellow deep sound that does not resonate into the cabin.

pic of flow
Old 07-16-2010, 10:08 AM
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Crotchety Old Bastard
 
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That muffler pictured was from a few years back and may not be exactly the same series. The internals were the same "X" as the dual in / dual out 80 series Magnaflow but with the top right leg missing on the "X". Looks like yours may be different.

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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 07-16-2010, 07:59 PM
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yeah, if you look into the right outlet you can see straight thru the left. There is a small bridge at the intersection that helps distribute the flow evenly as my drawing implies
Old 07-17-2010, 03:54 PM
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Crotchety Old Bastard
 
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Guess they changed the design or I had a different series. Yours is better.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 07-17-2010, 04:51 PM
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Maybe better for sound or output balance but probably not a performance improvement over the X design that would probably function a bit more like a straight through.

Would rather have a 3" straight through right exit only.

Such might not be noticeable as to low end power, probably would be a bit louder, but should have less internal turbulence and thus back pressure up top.

Just a guess.
Old 07-18-2010, 07:41 AM
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Crotchety Old Bastard
 
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It's better for accurate AFR measurement. Having an unbalance flow throws them off. I've tried them all and theory is a good guide but typically doesn't add up to measurable HP in the real world. I built a muffler just like the one Darin is using and saw no difference in performance. The key is to have an ID big enough to offset any turbulence or bends. If that is done the design is forgiving.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 07-18-2010, 11:10 AM
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oddly enough since adding the muffler the car seems to have much better low end. maybe cause it's quiet and gives the illusion of feeling like i'm giving it less throttle input. It is a joy to drive on the highway now.
Old 07-19-2010, 07:16 AM
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